I've actually started bathing mine more often (Weekly/Bi-weekly). I put a towel in the tub, soak it and allow about an inch of water above the towel in the 'deep' end. The towel that's in the 'shallow' end is not submerged. I let the water sit for an hour then put my snake in. I soak them for no longer than 5minutes. Within 5 minutes, they drink and poop. (Another reason we do this, makes handling much more enjoyable knowing you don't have to worry about any 'surprises' on you or the furniture )
I swear both my snakes love it. Neither have ever appeared stressed and/or flailing around trying to escape. My Ultra Anery clearly enjoys it more than my R/O.
She just finds a spot and relaxes, sometimes I put their coconut hide on the towel so they can soak for a few minutes in peace.
Both my snakes have had perfect sheds. Never had any flakiness or stuck eye caps, tail tips, etc. I wouldn't exactly contribute this 100% to regular bathing, but I do believe they benefit some semi-regular soaks! They do not soak in their water bowels either, or if they do, it's at night. But I don't see much change in their water levels so I'm guessing if they do, it's very rare.